mirror of
https://github.com/hajimehoshi/ebiten.git
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59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package rendertarget
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// #cgo LDFLAGS: -framework OpenGL
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//
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// #include <OpenGL/gl.h>
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import "C"
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import (
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"fmt"
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"github.com/hajimehoshi/go-ebiten/graphics"
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"github.com/hajimehoshi/go-ebiten/graphics/opengl/texture"
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)
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type RenderTarget struct {
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framebuffer texture.Framebuffer
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width int
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height int
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}
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func Create(width, height int, filter graphics.Filter) (
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*RenderTarget, *texture.Texture, error) {
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tex, err := texture.Create(width, height, filter)
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if err != nil {
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return nil, nil, err
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}
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framebuffer := tex.CreateFramebuffer()
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return &RenderTarget{framebuffer, width, height}, tex, nil
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}
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func CreateWithFramebuffer(width, height int, framebuffer texture.Framebuffer) (
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*RenderTarget, error) {
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return &RenderTarget{framebuffer, width, height}, nil
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}
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func (r *RenderTarget) SetAsViewport() {
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C.glBindFramebuffer(C.GL_FRAMEBUFFER, C.GLuint(r.framebuffer))
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err := C.glCheckFramebufferStatus(C.GL_FRAMEBUFFER)
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if err != C.GL_FRAMEBUFFER_COMPLETE {
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panic(fmt.Sprintf("glBindFramebuffer failed: %d", err))
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}
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C.glBlendFuncSeparate(C.GL_SRC_ALPHA, C.GL_ONE_MINUS_SRC_ALPHA,
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C.GL_ZERO, C.GL_ONE)
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width := graphics.AdjustSizeForTexture(r.width)
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height := graphics.AdjustSizeForTexture(r.height)
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C.glViewport(0, 0, C.GLsizei(width), C.GLsizei(height))
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}
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func (r *RenderTarget) ProjectionMatrix() [4][4]float64 {
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width := graphics.AdjustSizeForTexture(r.width)
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height := graphics.AdjustSizeForTexture(r.height)
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return graphics.OrthoProjectionMatrix(0, width, 0, height)
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}
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func (r *RenderTarget) Dispose() {
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f := C.GLuint(r.framebuffer)
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C.glDeleteFramebuffers(1, &f)
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}
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